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Home >> Subaru >> 2019 >> WRX Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostics) (Except For STI) (1 Of 4) >> Diagnostic Procedure With Diagnostic Trouble Code (DTC) >> DTC P0071: Ambient Air Temperature Sensor Circuit "A" Range/Performance >> Diagnostic Method

Diagnostic Method

Judge as NG when the following conditions are established.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
|Ambient air temperature 21 sec. after engine start - Intake air temperature 21 sec. after engine start| > Value from Map
|Ambient air temperature at engine start - Engine coolant temperature at engine start| > 25°C (45°F)
MAP SPECIFICATION

Intake air temperature (°C (°F)) -30 (-22) 45 (113) 60 (140) 80 (176)
|Ambient air temperature 21 sec. after engine start - Intake air temperature 21 sec. after engine start| (°C (°F)) 20 (36) 20 (36) 32 (57.6) 32 (57.6)

Time needed for diagnosis:  Less than 1 second

Malfunction indicator light illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.